feat: implement shipping line bookings management

- Add ShippingLineBookingsPage for listing and managing shipping line bookings.
- Create ShippingLineDocumentsModal for document uploads related to bookings.
- Introduce ShippingLineInitiateModal for initiating new shipping line bookings.
- Implement booking document state management with booking-doc-state utility.
- Add shipping line bookings service for API interactions.
- Update index to export new components and services.
- Enhance types for freight to include shipping line credits.

packages/types/src/freight/index.ts

@@ -188,6 +188,13 @@ export enum InvoiceSource {
   LastMile = "lastmile",
   /** Customs clearance service fee — billed on the booking invoice with the freight. */
   Clearance = "clearance",
+  /**
+   * A batch of shipping-line credits billed together. Unlike every other
+   * source, `sourceId` is the shipping line's id rather than a single record's:
+   * the invoice covers many bookings, and the credits themselves carry the
+   * per-booking link.
+   */
+  ShippingLineCredit = "shipping_line_credit",
 }
 
 export enum SchedulingStatus {